libdpkg: Reset error context errmsg after free()

This makes sure we are never going to doubly free it. Warned-by: gcc ASAN Stable-Candidate: 1.19.x

libdpkg: Reset error context errmsg after free()
This makes sure we are never going to doubly free it. Warned-by: gcc ASAN Stable-Candidate: 1.19.x
889848ed · Guillem Jover · 38cb8160 · 889848ed
Commit 889848ed authored 4 years ago by Guillem Jover
--- a/lib/dpkg/ehandle.c
+++ b/lib/dpkg/ehandle.c
@@ -173,6 +173,7 @@ error_context_errmsg_free(struct error_context *ec)
 {
  if (ec->errmsg != emergency.errmsg)
    free(ec->errmsg);
+  ec->errmsg = NULL;
 }

 static void